Java ArrayList removeAll

Question

我在做一个假的医院数据库。我有一个ArrayList，它结合了所有可能的时间，从理论上说，医生可以进行预约，而另一个ArrayList则拥有实际的注册预约。

Availability {
  int doctorid;
  String specialty;
  Date date;
  int order_of_appointment;
}
//////////

ArrayList<Availability> allTimes;

ArrayList<Availability> busyTimes;

我想要实现的是找到医生免费的时代。的结果(allTimes - busyTimes)

我试过使用allTimes.removeAll(busyTimes)，但它没有删除任何东西。

我确保在Availability类中重写了equals()方法，但是它仍然没有删除任何内容。

@Override
public boolean equals(Object o) {
  if (this == o) return true;
  if (!(o instanceof Availability)) return false;   
  Availability that = (Availability) o;
  return doctorid == that.doctorid &&
      order_of_appointment == that.order_of_appointment &&
      Objects.equals(specialty, that.specialty) &&
      Objects.equals(date, that.date);
} 

输出：

1. busyTimes =可用性{doctorid=1，专长=“内科”，date=2021-11-02，order_of_appointment=2}

1. allTimes =可用性{doctorid=1，专长=‘内科’，date=2021-11-02，order_of_appointment=1}，可用性{doctorid=1，专长=‘内科’，日期=2021-11-02，order_of_appointment=2}，可用性{doctorid=1，专业=‘内科’，日期=2021-11-02，order_of_appointment=3}

1. --我为freeTimes获得的输出与allTimes完全相同，尽管我希望它能取消与allTimes的约会

我完全不知道是什么导致了这一切。任何帮助都将不胜感激。提前感谢！

Answer 1

您没有显示如何创建数组，也没有显示如何添加元素。

我用ArrayLists做了一个简单的程序，并按预期工作：

import java.util.*;

class A {
  int id;
  A(int id) {
    this.id = id;
  }

  @Override
  public boolean equals(Object o) {
    return o instanceof A && this.id == ((A)o).id;
  }
  public String toString() {
    return String.format("A{id:%s}", id);
  }

  public static void main(String ... args) {
    List<A> a = new ArrayList<A>(Arrays.asList(new A(1), new A(2)));
    List<A> b = new ArrayList<A>(Arrays.asList(new A(2), new A(3)));
    a.removeAll(b);
    System.out.println(a);
  }
}

输出：

[A{id:1}]

Answer 2

问题是，即使我将日期格式设置为“”，它仍然将时间存储在date对象中。我将日期对象转换为字符串，然后比较字符串，这是可行的。谢谢你们所有人。

Answer 3

您需要用比较逻辑覆盖可用性类中的等于(Object)方法。

我实现了。请查收。

import java.util.Date;

public class Availability {

    private int doctorId;
    private String specialty;
    private Date date;
    private int orderOfAppointment;

    public Availability() {
        super();        
    }

    public Availability(int doctorId, String specialty, Date date, int orderOfAppointment) {
        super();
        this.doctorId = doctorId;
        this.specialty = specialty;
        this.date = date;
        this.orderOfAppointment = orderOfAppointment;
    }

    public int getDoctorId() {
        return doctorId;
    }

    public void setDoctorId(int doctorId) {
        this.doctorId = doctorId;
    }

    public String getSpecialty() {
        return specialty;
    }

    public void setSpecialty(String specialty) {
        this.specialty = specialty;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public int getOrderOfAppointment() {
        return orderOfAppointment;
    }

    public void setOrderOfAppointment(int orderOfAppointment) {
        this.orderOfAppointment = orderOfAppointment;
    }

    @Override
    public String toString() {
        return "Availability  [doctorId=" + doctorId + ", specialty=" + specialty + ", date=" + date
                + ", orderOfAppointment=" + orderOfAppointment + "]";
    }

    @Override
    public boolean equals(Object obj) {
        boolean returnVal = false;
        Availability busyslote = (Availability) obj;
        if (this.doctorId == busyslote.doctorId && this.orderOfAppointment == busyslote.orderOfAppointment
                && this.specialty.equalsIgnoreCase(busyslote.specialty) && this.date.equals(busyslote.date)) {
            returnVal = true;
        } else {
            returnVal = false;
        }

        return returnVal;
    }
}

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class AppointmentMain {

    public static void main(String[] args) {

        List<Availability> allAppointment = new ArrayList<>();
        List<Availability> attenedAppointment = new ArrayList<>();

        Availability obj1 = new Availability(1, "Internal Medicine", new Date(), 1);
        Availability obj2 = new Availability(1, "Internal Medicine", new Date(), 2);
        Availability obj3 = new Availability(1, "Internal Medicine", new Date(), 3);

        allAppointment.add(obj1);
        allAppointment.add(obj2);
        allAppointment.add(obj3);

        Availability obj4 = new Availability(1, "Internal Medicine", new Date(), 3);

        attenedAppointment.add(obj4);

        System.out.println("Befour count :" + allAppointment.size());
        allAppointment.removeAll(attenedAppointment);
        System.out.println("After count :" + allAppointment.size());
    }
}